<template>
  <div class="login_container">
      <div class="login_box">
          <!-- 头像 -->
          <div class="avatar_box">
              <img src="../assets/logo.png" alt="">
          </div>
          <!-- 表单 -->
          <el-form ref='loginFormRef' :model="loginForm" :rules="loginRules" label-width="0px" class="login_form">
              <!-- 用户名 -->
            <el-form-item prop="username">
                <el-input v-model="loginForm.username" prefix-icon="el-icon-user"></el-input>
            </el-form-item>
            <!-- 密码 -->
            <el-form-item prop="password">
                <el-input type="password" v-model="loginForm.password" prefix-icon="el-icon-lock"></el-input>
            </el-form-item>
            <!-- 按钮 -->
            <el-form-item class="btns">
                <el-button type="primary" @click="login">登录</el-button>
                <el-button type="info" @click="resetLoginForm">重置</el-button>
            </el-form-item>
          </el-form>
      </div>
  </div>
</template>

<script>
export default {
  name: 'Login',
  data() {
    return {
      // 登录表达那数据
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      loginRules: {
        username: [
          { required: true, message: '请输入登录名称', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入登录名称密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    resetLoginForm() {
      this.$refs.loginFormRef.resetFields()
    },
    login() {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        // await 配合 async 将返回的promise数据转换为数据
        const { data: res } = await this.$http.post('login', this.loginForm)
        // console.log(res);
        if (res.meta.status !== 200) return this.$message.error('登录失败！')
        this.$message.success('登录成功！')
        // 将登录成功之后的token，保留到客户端的sessionStorage中
        window.sessionStorage.setItem('token', res.data.token)
        // 通过编程式导航跳转到后台主页，路由地址是/home
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang='less' scoped>
    .login_container{
        height:100%;
        background-color: #274461;
    }
    .login_box{
        width:450px;
        height:300px;
        background-color:#fff;
        border-radius: 5px;
    /*  position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        margin: auto; */
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%,-50%);
    }
    .avatar_box{
        width: 130px;
        height: 130px;
        border:1px solid #eee;
        border-radius:50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%,-50%);
        background-color: #fff;
        img{
            width:100%;
            height:100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }

    .login_form{
        position: absolute;
        bottom:0px;
        width: 100%;
        padding: 0 20px;
        box-sizing: border-box;
    }

    .btns{
        display:flex;
        justify-content: flex-end;
    }
</style>
